… comes pretty darn close. Did America hunt down and destroy Communism in China, or is it still Communist?

It's still controlled by a Communist Party and it's still building communism. The revolution isn't over yet. Actually existing socialism.

Xi Jinping’s estimated net worth is $1.2b. Is that not capital?

Literally no, capital is productive. Businesses, factories, warehouses, restaurants, farms, etc. Money is not capital in a Marxist sense, it's merely a means of exchange. I'm also skeptical he is actually a billionaire, that sounds like it's just some rough estimate made up by probusiness propaganda.

"But Biden isn't a businessman!" I hear you say, and no, he isn't. He also isn't in charge. His and his party's political donors are, and they own capital and they own Biden. He's just another one of their investments.